/Engine/Source/Runtime/Landscape/Classes/LandscapeInfo.h
Moves all Splines to target Spline owner
void MoveSplines ( [ULandscapeSplinesComponent](API\Runtime\Landscape\ULandscapeSplinesComponent) * InSplineComponent, [TScriptInterface](API\Runtime\CoreUObject\UObject\TScriptInterface)< [ILandscapeSplineInterface](API\Runtime\Landscape\ILandscapeSplineInterface) > InNewOwner )